No, there's no way to do that. A PlayMakerFSM is a script component (MonoBehaviour) that stores an FSM as data. Converting that to a standalone script would be complicated... and generally that kind of machine generated code is not very easy to read/edit!
However actions are regular scripts that are run by the FSM framework and are very easy to read/edit/create. The system is a high level framework (FSM) used to organize low level code (Actions). The idea is that it's easier to edit, maintain and debug than a single monolithic script...